Subscription Option - Packet Retransmission
This facility, if subscribed to, allows a DTE to request the retransmission
of one or several consecutive data packets (which have not yet been acknowledged
at the packet level)
This is done by sending a REJ packet.
This facility is not very useful since level 2 ensures error free reception
of data, therefore it should not be necessary to retransmit the data.
UK(a) - supported, but not a subscription option, users always get it.
UK(b) - not supported
| X.2 LEVEL 3 PER USER SUBSCRIPTION | X.2 (1984) | UK(a) | UK(b) | interworking | ||
| OPTIONS | REF CLASS | now | now | R5a | R5b | R6 |
| Packet Retransmission | 1.7 A | . | . | . | . |
| Packet Retransmission...............| 1.7 A |
| . | . | . | . | | #
\info\computer\UK\x25-sub\ret-t.t1
&UKa& = yUKa support
DX1: always allowed (not a subscription option)
DX2: yes
TP4/III: ?
This facility already is supported by Public Network (whether the user wants it or not).
At release 4 it will be a table building option.
table build question:
TNDTED Q132( new ) subscribe: reject packet (YES/NO)
|TNDTED Q132| new | subscribe: reject packet.............# default:YES
I cannot think why we would want to turn this facility off. It would allow
us to charge extra for packet retransmission, which we already provide ?
UKa Answers
Question:
If we set Packet retransmission to NO would that save any
buffers, or TP resources?
Answer : No.
Question: Does the TP4 ever send a REJ packet to the DTE?
Answer : Yes, either can send Rej.
&UKb& = yUKb support
v 4.03
X.2 1984 ... A - additional service
X.2 1988 ... A - additional service
ISO 8878 compatibility
ONA compatibility
RD 0004 part 8:1.C (PICS proforma Public Network1984)
DS6 - Responding to packet retransmission requests.. -
DR6 - Requesting packet retransmission........... P = Prohibited
Therefore release 4 is compatible with ONA for this option.
Test plan and implementation issues
Currently Public Network always provides retransmission, it is not currently a subscription
option.
